# noqa: E501
"""Stdlib HTTP server for the dashboard (spec §5). No framework.

Exposes the API_CONTRACT endpoints over http.server + a tiny static adapter
for the frontend (scraper/dashboard/static/). A thin layer over
scraper.dashboard.api: parse HTTP line + query + JSON body, build an
api.Request, call api.run, write (status, body) back as JSON.

Run: python -m scraper.dashboard.server
"""
from __future__ import annotations

import json
import os
import sys
from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
from urllib.parse import urlparse, parse_qs

from . import api
from .api import Request, Services

STATIC_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)),
                            "static")

_CONTENT_TYPES = {
      ".html": "text/html; charset=utf-8",
      ".js": "text/javascript; charset=utf-8",
      ".css": "text/css; charset=utf-8",
      ".json": "application/json; charset=utf-8",
      ".svg": "image/svg+xml",
      ".ico": "image/x-icon",
      ".png": "image/png",
}


class DashboardHandler(BaseHTTPRequestHandler):
    def log_message(self, *args):
        pass

    def do_GET(self):
        return self._dispatch("GET")

    def do_POST(self):
        return self._dispatch("POST")

    def do_PUT(self):
        return self._dispatch("PUT")

    def do_DELETE(self):
        return self._dispatch("DELETE")

    def _dispatch(self, method):
        parsed = urlparse(self.path)
        if not parsed.path.startswith("/api"):
            return self._serve_static(parsed.path)
        try:
            query = parse_qs(parsed.query)
            flat = {}
            for k, v in query.items():
                flat[k] = v[0] if len(v) == 1 else v
            body = {}
            if method in ("POST", "PUT"):
                body = self._read_json_body()
            token = self._bearer()
            req = Request(
                method=method,
                path=parsed.path,
                query=flat,
                body=body,
                token=token,
                services=self.services,
                user_id=None,
             )
            status, payload = api.run(req)
        except Exception as exc:
            status, payload = 500, {
                 "error": {"code": "internal_error",
                             "message": str(exc)}}
        return self._write_json(status, payload)

    def _bearer(self):
        auth = self.headers.get("Authorization", "")
        if auth.lower().startswith("bearer "):
            return auth[7:].strip()
        return None

    def _read_json_body(self):
        length = int(self.headers.get("Content-Length") or 0)
        if length <= 0:
            return {}
        raw = self.rfile.read(length)
        try:
            data = json.loads(raw.decode("utf-8"))
        except (ValueError, UnicodeDecodeError):
            return {}
        return data if isinstance(data, dict) else {}

    def _serve_static(self, path):
        rel = path.lstrip("/") or "index.html"
        if ".." in rel or rel.startswith("/"):
            return self._write_raw(404, b"not found", "text/plain")
        fp = os.path.join(STATIC_DIR, rel)
        if os.path.isfile(fp):
            ctype = _CONTENT_TYPES.get(
                os.path.splitext(fp)[1], "application/octet-stream")
            with open(fp, "rb") as fh:
                body = fh.read()
            return self._write_raw(200, body, ctype)
        root = os.path.join(STATIC_DIR, "index.html")
        if os.path.isfile(root):
            with open(root, "rb") as fh:
                body = fh.read()
            return self._write_raw(200, body,
                                    "text/html; charset=utf-8")
        return self._write_raw(404, b"not found", "text/plain")

    def _write_json(self, status, payload):
        body = json.dumps(payload, ensure_ascii=False).encode("utf-8")
        return self._write_raw(status, body,
                                "application/json; charset=utf-8")

    def _write_raw(self, status, body, ctype):
        self.send_response(status)
        self.send_header("Content-Type", ctype)
        self.send_header("Content-Length", str(len(body)))
        self.send_header("Access-Control-Allow-Origin", "*")
        self.end_headers()
        if status != 204:
            self.wfile.write(body)


def make_handler(services, log_on=False):
    cls = type("BoundHandler", (DashboardHandler,),
                {"services": services})
    if log_on:
        cls.log_message = BaseHTTPRequestHandler.log_message
    return cls


def serve(host="127.0.0.1", port=8000,
          db_path=None, prefs_path="out/prefs.json",
          auth_path="out/auth.json", serve_static=True,
          log_on=False):
    services = Services.default(db_path=db_path,
                                prefs_path=prefs_path,
                                auth_path=auth_path)
    handler = make_handler(services, log_on=log_on)
    srv = ThreadingHTTPServer((host, port), handler)
    sys.stderr.write(
         "dashboard: http://%s:%d/   (static %s)\n"
         % (host, port, "on" if serve_static else "off"))
    try:
        srv.serve_forever()
    except KeyboardInterrupt:
        pass
    finally:
        srv.server_close()
    return 0


def main(argv=None):
    import argparse
    p = argparse.ArgumentParser(
        prog="scraper.dashboard",
        description="Serve the legislative dashboard (API + static UI).")
    p.add_argument("--host", default="127.0.0.1")
    p.add_argument("--port", type=int, default=8000)
    p.add_argument("--db", default=None,
                    help="SQLite path (default: db/daily_file.sqlite)")
    p.add_argument("--prefs", default="out/prefs.json",
                    help="preferences JSON file")
    p.add_argument("--auth", default="out/auth.json",
                    help="local-auth JSON file")
    p.add_argument("--no-static", dest="static", action="store_false",
                    help="serve API only, no static frontend")
    p.add_argument("--log", dest="log", action="store_true",
                    help="log HTTP requests to stderr")
    args = p.parse_args(argv)
    return serve(host=args.host, port=args.port,
                 db_path=args.db, prefs_path=args.prefs,
                 auth_path=args.auth, serve_static=args.static,
                 log_on=args.log)


if __name__ == "__main__":
    sys.exit(main())